Elevator-controlling apparatus.



D. C. LARSON. CONTROLLING APPARATUS. APPLICATION FILED MAR-29.1917- 15286358. v Patented Dec; 3, 1918.

2 SHEETS-SHEET l- .u::; L 44 5hr A Jay . INVENTOIA I MM BY ATTORNEY D. c. LARSON. ELEVATOR CONTROLLING APPARATUS.

APPLICATION FLLED MAR- 29. IBM- Patented Dec. 3, 1918.

I 2 SHEETS-SHEET 2.

lNVENTOl M M ATTORNEY UNITED sTAT s PATENT oEEIoE.

DAVIE c. LaRsoN, E roNKER's, NEW YO K, ASSIGNOR To 0TIs ELEVATOR COMPANY,

OF JERS Y CITY, NEW JERSEY, A CORPORATION or NEW JERSEY. 4

ELEVATOR-CONTROLLING .AIPIPARATUS.

To all whom'it may concern:

Be it known that 1, DAVID C. LARSON, a

' citizen of the United States, residing in Yonkers, in the county of Westchester and State ofNew York, have invented a new and useful Improvement in Elevator-Controlling Apparatus, of which the following is aspecification. I

This invention relates to improvements in control apparatus for elevators, it being directed more particularly to mechanism selectively to time the operation of the elevator car, this mechanism being commonly known as I automatic push-buttonmechanism.

' It is well known that car hoisting ropes or cables stretch'more or less in accordancewith the load on the car platform, and with the initial adjustment of the timing mechanism or floor controller which in standard practice is such-as to stop the car level with the landing for an average car load, a heavily loaded car .will, because of the stretch of the cable, stop short of or below the landing in ascendin and run past the landing in descending. owever, according to the present invention, this difficulty is overcome by providing a connection betweenthecar and floor controller apparatus,

wherebythe latter is adjusted more or less in accordance with the stretch of the hoisting cables. ment the fioor controller will act automatically to shutoif the motive powerand apply the car brake, later with a heavy load ascending and earlier with a heavy load descending, as compared with the original adjustment for the average car load, the effect being to stop the car level with the floor landing.

In the accompanying drawings, Figure 1 illustrates in a more or less diagrammatic manner, a typical electric elevator system Specification of Letters Patent.

With this improved arrange-' Patented Dec. a, 1918.

Application filed March 29, 1917. Serial N 0. 158,481.

invention as "tached .to ahoisting drum 2. The hoisting drum 2 is operable by the electric motor M.

. through the intermediary of a worm and gear connection 3. An electro-mechanical brake of a well known type is designated B.

Electro-magnetic reversing switches to control the motor Mare designated R. R, R controlling the motor for descending direction of car travel, and R for ascending directionof travel.

The automatic push button apparatus comprises car push buttons 4, 4, i", ha'll push buttons, 5, 5, 5", floor relay magnets 6. 6. 6". a non-interference magnet 7 ca: holding magnet 8, door contacts 9, and the floor controller F, the principle of operation of the latter being better understood by the diagrammatic illustration thereof, as in Fig. 1, the actual construction being as illustrated in Fig. 3, which construction is well known and substantially like that illustrated in the patent to ER. Carichofl", No. 783.174.

-The floor controller illustrated in Figs. 2 and 3, briefly stated. comprises a shaft 10 operable in unison with the movement of the elevator car through the intermediary of gearing 11. and other connections hereinafter described. Rocker arms 12. 12'. 12", 12", are carriedby the rock shaft 10, these arms. being adapted to actuate switches 13,

13', 13, 137', respectively.'-" The switches 13, 13", control the car in descending. being opened by their respective arms when rocked in-an anti-clockwise direction. which corresponds to descending direction of'car travel, and closed by movement of the sa d arms in a clockwise direction. Switches 13', 13" control the car in ascending. being opened by their respective arms when the latter rock in a clockwise direction, and closed by rocking of said arms in an anti-clockwise direction. It will be mentioned that one switch each is provided for the bottom and top landings L. L. two of these switches being provided for an intermediate landing L.

Each switch such as '13. for example, comprises a pair of separated depending contact strips 14. 14. secured to, but insulated from the controller framework 15. A

the said contacts.

conductor such as 16 is adapted to bridge niied so as to open their respective switches V 1 some distance more or less. due to the mowhen the car approaches within a predetermined distance of the landing. the effect being to disconnect the motor M from its source of supply and effect. an application of the brake B. After the above operation takes place, the car hasa tendency to coast mentum of the moving parts, and hence this initial adjustmentof the arm's. will for the average car load. allow of the coast of the car and bring the car to stop substantially levelwith the floor landing. However. since for a heavily loaded car. the coast thereof is less for ascending and greater for descending than that of a car with an ever;

age'load. and considering in addition to this the stretch of the cable due to the heavy ldad on the car'platform, it will be seen that the original adjustment will for the {heavy load condition resultin the car stopsome distance below the floor landing.

' In order automatically to adjust the rii'cker arms in accordance with this stretch or elongation of the hoisting cables 1. I provide an auxiliary rope or cable 21, one

end being connected to the elevator car. and

the other to a weight 22. vThe auxiliary cable connects with a lever 23 at an intermediate point- 24 thereon. the back drum counterweight cable 1 forming -a fulcrum at 2-5 on which the lever 23 is adapted to rock. A cable or chain 26 forms a connec tion whereby the rock shaft 10 of the floor controller is moved in unison with the movement of the elevator car. This cable or chain has one end connected to any desired one of the points '27. on the lever 23. thecable or chain engaging a sheave or sprocket wheel 28. which actuates the rock shaft 10 through the intermediary of the 'ing 11. A weight 30 which may he co .sC'fGd to encircle the cables 21 and l. secured to the opposite end of the cable or Chain 26. this weight bein cmewhat overbalanced by the action of the weight 22.

The diagrannnatic illustration of the tloor controller in Fig. 1. consists of two contactsegments 31. 32. adapted to make contact with stationary brushes 36 and 37. the brushes 33 and 3i. being connected to the windings of the reversing switches R. B. respectively. The contact segments 14513 be mounted upon a suitable insulating base and rotated in unison with the. move ment of the elevator car through the connection heretofore described in connection with Figs. 2 and 3. I I The operation will now be described, and since the system of circuits are Well known, they will be described only briefly.

In Fig. 1, the car is at rest at the second floor, the operating circuit being broken-at the brush 36 of the floor controller. Let it be assumed that the hall-buttonb" at the floor landing L is pressed, this closing a circuit for the winding of the reversing switch R as follows: main. wire 38, door contacts 9, through the two windings of the non-interference magnet 7, contacts 39. wire 40. button 5", wires M Q. winding of floor relayti. W1I643f-b1113l1 3'7, segment 32 to brush 3%. wire 44. thence through windingof reversing switch R to line.

The reversing switch R will now close and effect the release of the brake B and operationof the motor M to operate the car inan ascending'direction. Operation ofthe car in an ascending direction efi'ects rota tion of the sheave 0r sprocket 28 in' a counter-clockwise direction. the g egments 31 32 which correspond to the rock shaft 10 of ,Figs. 2 and 3. being rotated in a reverse or clockwise direction. Thus when the elevator car approaches within a predetermined distance of the landing L". the operating circuit is opened by the segment 32 disengaging the brush- 37., In this manner the circuit to the reversing switch winding It is opened and the reversing switch will open and disconnect the motor from its source of power supply and effect application of the brake to retard and stop the car. From the above description it will be seen that the floor controller functions to control the car in its movement after a button is pressed and to automatically stop the carat the desired floor landinglthe fiOOfgcOlitI'OllGI functioning in a similar manner by, pressing a car push-button.

For descending direction of car'ftr-avel.

the contact segments 31. 32 and rock shaft 10 will rotate in ananti-clockwise direction.

Coming now to the action of the improved connection automatically-to adjust the contact segments or rock shaft 10. in accordance with the stretch of the cable. let us as 3 ee sduoto stretch of oaks 2- iever 50 I ll l-t eouni-erwelght cable eenjnecwi to the roller which soars-is with oui'ale. 'the level tlrough. its roeking movement ,ocw tim the standing cable rock er frame againsa the action oi It is obvious that the results (i by this construction are the 4:11 the construct-ions heretofore dethe standing m i-ngthus descrioed the invention, and

tygtgh of th ji i ti Without limiting myself to the precise demore l-ss, by changmg tails of consiructlon and arrangements of ueoizion of we cable, or one parts. what new and desire to se- 2 claim is 2-3 1 e1ative1y to the {1216mm sure, b Pateu' of the United States, W111 thus be seen too sens Pee L gvor-eompensate for the stretch of t l lu-- hois-iing apparatus, the combinaiug some L ii 1 with the ear, a car hoisting cable, a In' Fig. ggypicaltruciion (11 motor to operate Lho car, a brake, a push "is ifiuszmted, the car-110315; button system of elrcoits and a fioor controlporting the oar at Ier to control the motor and brake, and counterweight the Gm means operate e floor controller in uniarouud the 13132 son with the car and to effect adjustment of 1 g r, I thi the floor controller in accordance with ment of the czar due 5 stretch e 1e hoisting cable. getioo. of the hoistingoal '2. 1: hoisting apparatus, the combinehon w s u-eeans to operate *the car, (em-011mg: mechanism having wg msnent men-i1 through the some 2 in. a eoun movement being g1c1 ustment to time the opemtionofthe our and autonmtically stop the same at a ,pre-

rmined point, and means to vary she cable or chain Mun bar a hon 121 6115 the e m ope-rate 2111s ear con- 1' g .oovilig permanent adhoi out to 1. me the operation of the car 12. automatically stop the same an: prede mined g oint and means responsive to the The to vary the timing operation and effect oesi stopping operation'later for sire r ding iozui and earlier 01 a descendes 1% as oomparefi. with the timing Q1 sctuu the permanent adjustment. I

hoisting apparatus, the combination neon the 02.1%, (11 means to operate the ear 1 car l "e. oontrolling mechanism havgh' the intermediary of a cable 52' The leverfiO earn-2s a i of circuits and a fioor controller to'control the motive ineans,a'lever fulcrumed on the hoisting cable, and operatively connected to the floor controller, and means to actuate the said lever in accordance with the load on the car.

(3. In hoisting apparatus, the combination with the car, motive means to operate the car, a hoisting cable, a push-button system of circuits and a floor controller to control the motive means, a lever fulcrumed on the hoisting cable and operatively connected to the floor controller, and means to actuate the said lever in accordance with the stretch of the hoisting cable.

7 In hoisting apparatus, the combination with the car, motive means to operate the car, a hoisting cable, a push button system of circuits and a' floor controller to control the motive means, a lever tulcrumed on the hoisting cable and operatively connected to" the floor controller, and a flexible connection between the car and the said lever operable to rock the saicllever.

8. In hoisting apparatus, the combination with the car, motive means to operate the car, a hoisting cable, a push button system of circuits and a floor controller to control the motive means, a lever fulcrumed 'on the hoisting cable, a flexible member connecting the lever and floor controller to actuate thc latter in unison with the car, and a flexible member connecting the car and the said lcver, operable to rock the latter in accordance with the load on the car.

ln testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

DAVID C. LARSON.

Witnesses ERNEST L. GALE, J12, JAMES G. BETI-IELL. 

